Here's what rhymes with irretentiveness.
attentiveness inattentiveness retentiveness inventiveness Words that almost rhyme with irretentiveness
pensiveness tenseness offensiveness protectiveness restiveness denseness objectiveness festiveness effectiveness defensiveness ineffectiveness suggestiveness defectiveness extensiveness oppressiveness perceptiveness receptiveness contentedness deceptiveness expensiveness intensiveness obsessiveness inoffensiveness aggressiveness penitence connectedness possessiveness repressiveness inexpensiveness reticence expressiveness impressiveness progressiveness apprehensiveness scarceness caribous residence headmistress unexpectedness celibates collectivists disconnectedness hesitance fetishists residents comprehensiveness embellishments counterintelligence